<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        .login-box {
            margin: 50px;
        }

        .login-box .title {
            font-weight: bold;
            line-height: 80px;
            text-align: center;
        }

        .login-box .block {
            margin: 30px 0;
        }

        .login-box .block input {
            height: 40px;
            padding-left: 20px;
            border: 1px solid #ccc;
            border-radius: 5px;
            width: 100%;
            outline: none;
            box-sizing: border-box;
        }
    </style>
</head>

<body>
    <div class="login-box">
        <div class="title">登录页</div>
        <div class="block">
            <input type="text" placeholder="输入用户名">
        </div>
        <div class="block">
            <input type="password" placeholder="输入密码">
        </div>
        <div class="block">
            <input type="button" value="登陆">
        </div>
    </div>
</body>
</html>
<script src="./text4-ajax.js"></script>
<script>
    //先获取三个input标签
    let inputs = document.querySelectorAll('.login-box .block input')
    // console.log(inputs);
    //给button绑定点击事件,button是第三个input
    inputs[2].onclick = function(){
        console.log(111);
        //对表单内容做校验 （ 为空校验，格式校验 ）
        //如果不为空
        if( inputs[0].value && inputs[1].value ){
                //如果输入的是任意四个数字字符
            if( /^\d{4}$/.test(inputs[1].value) ){
                //通过校验，发送登录请求
                ajax( 'get' , 'https://yantianfeng.com/api/login' , { username:inputs[0].value , password:inputs[1].value } , function(user){
                    console.log(user);
                    if( user.status == 200 ){
                        console.log('登陆成功');
                    }
                    else{
                        console.log('登陆失败');
                    }
                } )
            }
            else{
                alert('请输入正确的密码!')
            }
        }
        else{
            alert('用户名/密码不能为空!')
        }
    }
</script>